feat(coding-agent): session-bound scheduled tasks with one-shot and interval schedules

packages/coding-agent/src/core/extensions/types.ts

@@ -114,6 +114,15 @@ export interface ExtensionUIDialogOptions {
 	 * drift is visible because no output follows the dialog to fill the gap back in.
 	 */
 	overlay?: boolean;
+	/**
+	 * Ask about one action and forget the answer.
+	 *
+	 * A host grants standing permissions by tool name ("allow for this session").
+	 * A dialog that manages a durable object — a scheduled task, say — must not
+	 * join that grant: one approval would otherwise silently cover every later
+	 * change of the same kind.
+	 */
+	once?: boolean;
 	/**
 	 * Reference lines for an input dialog, rendered under the title and above the
 	 * editable row. Use them to show the accepted spellings of an answer that has

packages/coding-agent/src/core/session-manager.ts

@@ -981,6 +981,25 @@ export class SessionManager {
 		return this.persist;
 	}
 
+	/**
+	 * Persist a newly created session before its first turn. Host-created task
+	 * sessions need a file that can be reopened after a restart.
+	 */
+	persistNewSessionHeader(): string | undefined {
+		if (!this.persist || !this.sessionFile || this.flushed) return this.sessionFile;
+		const fd = openSync(this.sessionFile, "wx");
+		try {
+			for (const entry of this.fileEntries) {
+				writeFileSync(fd, `${JSON.stringify(entry)}\n`);
+			}
+		} finally {
+			closeSync(fd);
+		}
+		this.flushed = true;
+		this._notifyFilePersisted(this.sessionFile, "create");
+		return this.sessionFile;
+	}
+
 	getCwd(): string {
 		return this.cwd;
 	}